DodgeMan Posted November 18, 2012 Share Posted November 18, 2012 11kba5325r only number on the main box on my LJ's transmission. Anyone got any ideas. Need help. Trying to figure out if it's a OD box or not.11.00 24 tires -902 rears -White-spicer 8031c 3 speed - trying to figure out the main box so I know how fast this truck will go down the road. Quote Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/ Share on other sites More sharing options...
BOB DINGSDALE Posted November 18, 2012 Share Posted November 18, 2012 dodgeman: my tr 720 in my LJSWX is 11KBA 5325P2.thats the.078 OD in 5th.your a box is .075 in 3rd.Mine has 11.00x22 tires and 9.02 rears with .813 OD in 4th in A box and I can't reach 50 .Should be on left side of trans which one it is. Quote Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/#findComment-146746 Share on other sites More sharing options...
BOB DINGSDALE Posted November 18, 2012 Share Posted November 18, 2012 dodgeman:niether my LJSW or my LJSWX parts books have got your number in them. Quote Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/#findComment-146765 Share on other sites More sharing options...
Vladislav Posted November 19, 2012 Share Posted November 19, 2012 Too interesting. I have TRD37 in the NR with 5th OD 0.78 and auxilary 1.34/direct, 11.0024 (12.00R24 now, that look the same od then 11.0024) and 9.02 rears.A manual gives me 37.7 mph on 5th. I would be happy having 50 although afraid of change steps between gears getting rears too faster.Does anybody have an experience changing gears in a box, not whole a unit?Dodgeman - if you have your gearbox on a floor you can count shafts revolutions. If not...Mine's book conteins all the ratios for all gears, it's war department though. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/#findComment-146901 Share on other sites More sharing options...
BOB DINGSDALE Posted November 19, 2012 Share Posted November 19, 2012 vladisav: with that trans and a auxilary with a overdrive in it -maybe a 8031 C which is .075 and your size of tires and wheels with a Cummins @ 2100 it will do 50+.If you have a gas engine with a higher rpm you will go faster. Quote Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/#findComment-146903 Share on other sites More sharing options...
Vladislav Posted November 19, 2012 Share Posted November 19, 2012 Not that way Bob.I have Mack TRD37 duplex tranny with Mack ED Lanova 131bhp unit.Main box with 0.78 and auxillary high direct.Rears are Mack camelback that looks quit the same as on your LJSW. Maybe less heavy rating.With classic 9.02's.I'm planning the truck for long trips in the future so looking for highway speeds.Thinking about change rears or something in the gearbox although a bit in a doubt about not too powerfull engine.The truck has his netto 10 metric tons. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/#findComment-146909 Share on other sites More sharing options...
Vladislav Posted November 19, 2012 Share Posted November 19, 2012 vladisav: with that trans and a auxilary with a overdrive in it -maybe a 8031 C which is .075 and your size of tires and wheels with a Cummins @ 2100 it will do 50+.If you have a gas engine with a higher rpm you will go faster.Bob, I just came in a line of you and Dodgeman discussion, that's why mistakes got place. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/#findComment-146910 Share on other sites More sharing options...
BOB DINGSDALE Posted November 19, 2012 Share Posted November 19, 2012 Vladislav: When I first got my LJ it had the TR720 main and a browny 8031-L which was direct in 3rd.Put truck at 40 MPH.Your's is not quite direct which would make it under 40 mph.If you put a aux in with a OD you would get faster speed.I'm 20 tonnes with trailer which is 9 tonnes.I can do 46.8 calulated on paper .I now have deep lug tires so I think I would be around 50.This is with a >813 OD in A box. Quote Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/#findComment-146932 Share on other sites More sharing options...
DodgeMan Posted November 20, 2012 Author Share Posted November 20, 2012 dodgeman:niether my LJSW or my LJSWX parts books have got your number in them.Ill look when i get home tomorrow after work.... Quote Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/#findComment-146965 Share on other sites More sharing options...
Vladislav Posted November 20, 2012 Share Posted November 20, 2012 Vladislav: When I first got my LJ it had the TR720 main and a browny 8031-L which was direct in 3rd.Put truck at 40 MPH.Your's is not quite direct which would make it under 40 mph.If you put a aux in with a OD you would get faster speed.I'm 20 tonnes with trailer which is 9 tonnes.I can do 46.8 calulated on paper .I now have deep lug tires so I think I would be around 50.This is with a >813 OD in A box.Bob, I see at least two barriers to go that way.At first the A box wich is Mack built fits to the main with a gear fitted to the rear end of the main box spline shaft. That gear mates to A contershaft's constant mesh. And makes A low. A direct is realized by locking of main and A spline shafts just unifying them. So changing from A with low into A OD I need to change a set of a auxillary with a gear from the end of main box spline shaft. Haven't many ideas from where to get disassembled box with gears that shure fits into mine.And there is a second issue. The A box made to supply intermedian steps for the main. The last one has too big step betveen 3rd and 4th. The man who drives completely the same truck told me he shifts 2h-3h-4l-4h-5h(OD) I had the idea to change gear set of 5th(OD) in main box for 3rd from another any one and get inter step I need. But I loose main box OD that way. Can try to do that having extremely high rears, on my count near 5.7.What the engine your LJ actually has? Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/#findComment-147093 Share on other sites More sharing options...
BOB DINGSDALE Posted November 20, 2012 Share Posted November 20, 2012 VLADISAV: The A box I'm refering too is a 3 or 4 speed mounted separatly from main trans.7000 or 8000 series Brown-Lipe.My LJSWX has a cummins 220hp engine(origanal numbers)TR720 main and a Brown-Lipe 8041D Aux box.Truck now has double OD..078 and .813 into 9.02s Quote Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/#findComment-147108 Share on other sites More sharing options...
Vladislav Posted November 22, 2012 Share Posted November 22, 2012 Shure it's easier having a separate A box.My way is fighting original components. With inside modifications if they are provided good.I haven't opened a gearbox yet, the time to collect ideas around. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/28422-lj-main-box/#findComment-147435 Share on other sites More sharing options...
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